scholarly journals Temporal and spatial changes of water quality and management strategies of Dianchi Lake in southwest China

2014 ◽  
Vol 18 (4) ◽  
pp. 1493-1502 ◽  
Author(s):  
T. Zhang ◽  
W. H. Zeng ◽  
S. R. Wang ◽  
Z. K. Ni
Keyword(s):  
Water Quality ◽  
Pollution Control ◽  
Southwest China ◽  
Management Strategies ◽  
Control Measures ◽  
Current Status ◽  
Dianchi Lake ◽  
Chl A ◽  
Spatial Changes ◽  
Temporal And Spatial

Abstract. Temporal and spatial changes to the water quality of Dianchi Lake in southwest China were investigated using monthly monitoring data from 2005 to 2012. Dianchi Lake is divided into two parts, Caohai Lake and Waihai Lake, by a man-made dike. Caohai Lake lies at the north of Dianchi Lake, while Waihai Lake is the main water body of Dianchi Lake and accounts for 96.7% of the whole area of the lake. Based on the analysis of total phosphorus (TP), total nitrogen (TN), and chlorophyll a (Chl a) concentrations, it was determined that, in Caohai Lake, the annual concentrations of these variables ranged from 0.19–1.46 mg L−1, 6.11–16.79 mg L−1, 0.06–0.14 mg L−1, respectively. In addition, the annual concentrations of TP, TN and Chl a in Waihai Lake ranged between 0.13 and 0.20 mg L−1, 1.82 and 3.01 mg L−1, and 0.04 and 0.09 mg L−1, respectively. Cluster analysis (CA) classified the 10 monitoring sites into two clusters (cluster A and cluster B) based on similarities of water quality characteristics. Our data revealed that the current status of water quality within Caohai Lake was much worse than that of Waihai Lake. Water quality was seriously degraded during the economic boom near the period of the "Eleventh Five-Year Plan" (2005–2010), and gradually improved from 2010 to 2012 because of the "standard emission directive to industry". The main factors that influenced the spatial and temporal changes to water quality were natural factors including lake evolution and regional characteristic as well as human factors such as pollution load into the lake and management strategies that were already adopted. Some activities and regulations were implemented to enhance the lake environment by controlling wastewater emissions and establishing regulations to protect the lakes in the Yunnan Province. However, problems with institutional fragmentation (horizontal and vertical), simple treatment methods, low-intensity investment in pollution control, and lack of meaningful endogenous pollution control strategies were still present in the lake management strategy. To solve these problems, suitable control measures are needed, especially considering the current old-age status of Dianchi Lake. The fundamental improvement of the water quality within Caohai Lake was dependent on the measures taken in the upper reaches of the Caohai Watershed, including further recovery of submerged plants, resource utilization by floating plants and the reinforcement of sediment disposal. Management strategies for endogenous pollution in Waihai Lake were mainly dependent on restocking algae-eating fish and the ecological restoration of macrophytes. In this way, the swamping trend and the ageing process that is occurring in Dianchi Lake can be stunted. And the management strategies would be a contribution to the management of water conflicts between mankind and ecosystems in similar lakes.

scholarly journals Temporal and spatial changes of water quality and management strategies of Dianchi Lake in southwest China

2013 ◽  
Vol 10 (12) ◽  
pp. 15409-15432 ◽  
Author(s):  
T. Zhang ◽  
W. H. Zeng ◽  
S. R. Wang ◽  
Z. K. Ni
Keyword(s):  
Water Quality ◽  
Pollution Control ◽  
Southwest China ◽  
Management Strategies ◽  
Control Measures ◽  
Current Status ◽  
Dianchi Lake ◽  
Chl A ◽  
Spatial Changes ◽  
Temporal And Spatial

Abstract. Temporal and spatial changes to the water quality of Dianchi Lake in Southwest China were investigated using monthly monitoring data from 2005 to 2012. Based on the analysis of total phosphorus (TP), total nitrogen (TN), and chlorophyll a (Chl a) concentrations, it was determined that, in Caohai Lake, the annual concentrations of these variables ranged from 0.19–1.46, 6.11–16.79, 0.06–0.14 mg L−1, respectively. In addition, the annual concentrations of TP, TN and Chl a in Waihai Lake ranged between 0.13–0.20, 1.82–3.01, 0.04–0.09 mg L−1, respectively. Cluster Analysis (CA) classified the 10 monitoring sites into two groups (group A and group B) based on similarities of water quality characteristics. Our data revealed that the current status of water quality within Caohai Lake was much worse than that of Waihai Lake. Water quality was seriously degraded during the economic boom near the period of the "Eleventh Five-Year Plan" (2005–2010), and gradually improved from 2010 to 2012 because of the "standard emission directive to industry". The main factors that influenced the spatial and temporal changes to water quality were natural factors including lake evolution and regional characteristic as well as human factors such as pollution load into the lake and management strategies that were already adopted. Some activities and regulations were implemented to enhance the lake environment by controlling wastewater emissions and establishing regulations to protect the lakes in the Yunnan Province. However, problems with institutional fragmentation (horizontal and vertical), simple treatment methods, low-intensity investment in pollution control, and lack of meaningful endogenous pollution control strategies were still present in the lake management strategy. To solve these problems, suitable control measures are needed, especially considering the current old-age status of Dianchi Lake. The fundamental improvement of the water quality within Caohai Lake was dependent on the measures taken in the upper reaches of the Caohai Watershed, including further recovery of submerged plants, resource utilization by floating plants and the reinforcement of sediment disposal. Management strategies for endogenous pollution in Waihai Lake were mainly dependent on restocking algae-eating fish and the ecological restoration of macrophytes. In this way, the swamping trend and the ageing process that is occurring in Dianchi Lake can be stunted.

scholarly journals Water balance computation and water quality improvement evaluation for Yanghe Basin in semiarid area of North China using coupled MIKE SHE/MIKE 11 modeling

2021 ◽  
Author(s):  
Ruifen Liu ◽  
Zeshi Li ◽  
Xiaokang Xin ◽  
Defu Liu ◽  
Jialei Zhang ◽  
...  
Keyword(s):  
Water Quality ◽  
Quality Improvement ◽  
Pollution Control ◽  
North China ◽  
Hydrological Cycle ◽  
Control Measures ◽  
Semiarid Area ◽  
Mike She ◽  
Water Quality Improvement ◽  
Mike 11

Abstract Water shortage and water pollution are two prominent issues in North China. Understanding hydrological cycle and water-quality changes in response to pollution control measures is fundamental for a better water management there. Using coupled MIKE SHE/MIKE 11 modeling, various hydrological components in Yanghe Basin in semiarid area of North China were quantified for three typical hydrological years and concentrations of COD and TP in a national monitoring section of Yanghe were evaluated with/without pollution control measures. The modeling results show that the underground water storage of Yanghe Basin gets depleted due to evapotranspiration compensation and groundwater utilization regardless of hydrological condition, indicating an unsustainable in-situ water resource utilization. Water quality goals set for Yanghe (COD ≤ 20 mg/L and TP ≤ 0.2 mg/L) can hardly be achieved if pollution control measures are not taken, especially for a dry hydrological year. Depending on hydrological conditions, non-point source control technology-related projects in a 109-km2 village and a 7-km river-channel wetland in mainstream of Yanghe will have a positive effect or negligible effect on water quality improvement. To meet water quality goals, implementation of three wetlands is an effective and economic way.

scholarly journals Physicochemical and Microbiological Water Quality Assessment of Aba Waterside River, Aba, Nigeria

2019 ◽  
Vol 3 (1) ◽  
pp. 142-148
Author(s):  
L. O. Bobor ◽  
C. M. Umeh
Keyword(s):  
Water Quality ◽  
Drinking Water ◽  
Management Strategies ◽  
Oxygen Demand ◽  
Water Quality Monitoring ◽  
Control Measures ◽  
Fecal Coliforms ◽  
Water Quality Control ◽  
Inorganic Substances ◽  
The Impact

The indiscriminate disposal of industrial effluents and solid wastes in surface water bodies is detrimental to humans and aquatic organisms. Water quality monitoring is critical to identify pollutants of concern and develop effective management strategies. Hence, this study was conducted to assess the impact of waste disposal on the water quality of Aba Waterside River, Ogbor hill, Aba. Grab samples were collected upstream, midstream and downstream and some physicochemical and microbiological parameters were analyzed in accordance with standard methods for the analysis of water and wastewater. The results were compared with the Nigerian standard for drinking water quality and the national environmental effluent limitation regulations. Turbidity levels (10 -31mg/l) exceeded the maximum permissible levels for drinking water (5mg/l) and may be associated with higher levels of embedded disease-causing microbes and potentially harmful organic and inorganic substances. The biological oxygen demand midstream (1960mg/l) was remarkably high due to the effluent discharged from the abattoirs at that point. Fecal coliforms (3-198MPN/100ml) were detected in all samples, indicating the presence of other potentially harmful microorganisms. The findings of this study indicate that the water is unsuitable for direct drinking water purposes and stringent water quality control measures should be implemented.

scholarly journals Assessing the Trend of the Trophic State of Lake Ladoga Based on Multi-Year (1997–2019) CMEMS GlobColour-Merged CHL-OC5 Satellite Observations

Sensors ◽  
2020 ◽  
Vol 20 (23) ◽  
pp. 6881
Author(s):  
Augustine-Moses Gaavwase Gbagir ◽  
Alfred Colpaert
Keyword(s):  
Water Quality ◽  
Trophic State ◽  
Current Knowledge ◽  
Management Strategies ◽  
Paper Mill ◽  
Warming Trend ◽  
Satellite Observations ◽  
Lake Ladoga ◽  
General Reference ◽  
Chl A

The trophic state of Lake Ladoga was studied during the period 1997–2019, using the Copernicus Marine Environmental Monitoring Service (CMEMS) GlobColour-merged chlorophyll-a OC5 algorithm (GlobColour CHL-OC5) satellite observations. Lake Ladoga, in general, is mesotrophic but certain parts of the lake have been eutrophic since the 1960s due to the discharge of wastewater from industrial, urban, and agricultural sources. Since then, many ecological assessments of the Lake’s state have been made. These studies have indicated that various changes are taking place in the lake and continuous monitoring of the lake is essential to update the current knowledge of its state. The aim of this study was to assess the long-term trend in chl-a in Lake Ladoga. The results showed a gradual reduction in chl-a concentration, indicating a moderate improvement. Chl-a concentrations (minimum-maximum values) varied spatially. The shallow southern shores did not show any improvement while the situation in the north is much better. The shore areas around the functioning paper mill at Pitkäranta and city of Sortavala still show high chl-a values. These findings provide a general reference on the current trophic state of Lake Ladoga that could contribute to improve policy and management strategies. It is assumed that the present warming trend of surface water may result in phytoplankton growth increase, thus partly offsetting a decrease in nutrient load. Precipitation is thought to be increasing, but the influence on water quality is less clear. Future studies could assess the current chemical composition to determine the state of water quality of Lake Ladoga.

Analysis and Recommendations of Administrative Management Measures to Control Environmental Pollutions

2012 ◽  
Vol 433-440 ◽  
pp. 2566-2570
Author(s):  
Xiao Ling Fang
Keyword(s):  
Environmental Management ◽  
Pollution Control ◽  
Environmental Management System ◽  
Control Measures ◽  
Current Status ◽  
Economic Policies ◽  
Advantages And Disadvantages ◽  
Management Measures ◽  
Level Of Economic Development ◽  
Improvement Measures

Pollution problem has become a major social problem, and its existence affects the quality of our life and limits a higher level of economic development. How to better control pollutions has become a more serious practical problem before us. In this paper, firstly, it analyzes the advantages and disadvantages of main pollution control measures in the aspects of sewage charges, tradable discharge permit system, subsidies and mandatory technique and so on, and then describes the basic policy of environmental protection, pointing out that the performance of the environmental management policies and systems shows more and more in adaptation and gap, in which not only the environmental economic policies and systems are not perfect, with a low environmental efficiency, but also the entire environmental management system does not meet the needs of the current situation. Finally, it aims at the current status of pollution control in China, through a multi-perspective analysis of improvement measures in the hope of helping the pollution control in China.

RESEARCH: Are Recent Watershed Disturbances Associated with Temporal and Spatial Changes in Water Quality of Lake George, New York, USA?

1997 ◽  
Vol 21 (5) ◽  
pp. 725-732 ◽  
Author(s):  
Bahram Momen ◽  
Larry W. Eichler ◽  
Charles W. Boylen ◽  
Jonathan P. Zehr
Keyword(s):  
Water Quality ◽  
New York ◽  
Spatial Changes ◽  
Temporal And Spatial ◽  
Lake George

scholarly journals Water Chemistry of Kolong River, Assam, India and Management Strategies

2019 ◽  
Vol 8 (3) ◽  
pp. 7567-7572 ◽  
Keyword(s):  
Water Quality ◽  
Pollution Control ◽  
Management Strategies ◽  
Oxygen Demand ◽  
State Intervention ◽  
Chemical Parameters ◽  
Economic Implications ◽  
Four Seasons ◽  
Physico Chemical ◽  
Central Pollution Control Board

Kolong river which is located in Nagaon district of Assam, India is among the 275 most polluted rivers in India, according to a report of the Central Pollution Control Board, Government of India. The rise in pollution with respect to rivers over the last few decades due to their incredible importance in several human uses as well as a medium for provision of ecosystem services all over the world. The present investigation was carried out for a period of four seasons, namely, Pre-monsoon, Monsoon, Retreating Monsoon and Winter for the year 2017. Samples of water from two sites of the River Kolong, namely, Site I (Jakhalabandha) and Site II (Nagaon Town), were collected and analysed. The physico-chemical parameters such as water temperature, pH, Conductivity, Alkalinity, Transparency, Hardness, Chloride, Magnesium, Phosphate, Dissolved Oxygen (DO), Biochemical Oxygen Demand (BOD) and Chemical Oxygen Demand (COD) were evaluated. Observations imply that the water quality in Site II was poor and unfit for drinking, compared to Site I. The present study also includes a discussion on the economic implications of Kolong’s water quality and the strategies for its management. The study finally emphasizes that state intervention and people’s participation is essential for maintaining and preserving the ecological health of the Kolong river in its pristine state.

scholarly journals Time-Series Analysis of Surface-Water Quality in Xiong’an New Area, 2016–2019

2020 ◽  
Author(s):  
Mingxiu Wang ◽  
Yue Yao ◽  
Qian Shen ◽  
Hongjie Gao ◽  
Junsheng Li ◽  
...  
Keyword(s):  
Water Quality ◽  
Surface Water ◽  
Pollution Control ◽  
Surface Water Quality ◽  
Study Data ◽  
Control Measures ◽  
Chinese Government ◽  
Water Turbidity ◽  
Sentinel 2

AbstractThe Xiong'an New Area was established by the Chinese government on 1 April 2017 as a new district in the Hebei Province, and soon after its establishment, investigations on the waterbodies of the district began to initiate governance. In this study, data from 105 Sentinel-2 cloudless images for the period April 2016–September 2019 were analysed to understand the changes in the concentrations of chlorophyll-a and water turbidity in surface waterbodies of the Xiong'an New Area. The results suggest that (1) the water quality shows an overall improving trend owing to surface-water pollution control measures by the Chinese government in the region; (2) the turbidity of the surface waterbody declined gradually particularly after the spring of 2017; (3) the concentration of chlorophyll-a shows a weak decreasing trend, with a low value in spring and a high value in summer with a four-year average of 31.3 μg/L; and (4) by comparing the results of the water quality of two ponds inside and outside the Lake Baiyangdian and the overall water quality of Xiong'an New Area, the changes in turbidity and chlorophyll-a concentration during the study period were consistent.

scholarly journals Effects of Farming Activities on the Temporal and Spatial Changes of Hydrogen and Oxygen Isotopes Present in Groundwater in the Hani Rice Terraces, Southwest China

Water ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 265
Author(s):  
Chengjing Liu ◽  
Yuanmei Jiao ◽  
Dongmei Zhao ◽  
Yinping Ding ◽  
Zhilin Liu ◽  
...  
Keyword(s):  
Stable Isotope ◽  
High Intensity ◽  
Southwest China ◽  
Isotope Composition ◽  
Agricultural Watershed ◽  
Spatial Effects ◽  
Elevation Gradients ◽  
Groundwater Circulation ◽  
Spatial Changes ◽  
Temporal And Spatial

Landform changes caused by human activities can directly affect the recharge of groundwater, and are reflected in the temporal and spatial changes in groundwater stable isotope composition. These changes are particularly evident in high-intensity farming areas. In this study, we tested and analyzed groundwater stable isotope samples at different elevations of rice terraces in a typical agricultural watershed of the Hani Terraces, a World Heritage Cultural Landscape in southwest China. Thus, we determined the characteristic variations and factors that influence the temporal and spatial effects on groundwater stable isotopes in the Hani Terraces, which are under the influence of high-intensity farming activities. The elevation gradients of δ18O and δ2H in groundwater are significantly increased due to farming activities. The values were 0.88‰ (100 m)−1 and −4.5‰ (100 m)−1, respectively, and they changed with time. The groundwater circulation cycle is approximately three months. We also used the special temporal and spatial variation characteristics of the groundwater isotopes as a way to evaluate the source and periodic changes of groundwater recharge. In addition, high-intensity rice farming activities, such as ploughing every year from October to January can increase the supply of terraced water to groundwater, thus ensuring the sustainability of rice cultivation in the terraces during the dry season. This demonstrates the role of human wisdom in the sustainable and benign transformation of surface cover and the regulation of groundwater circulation.

Sign in / Sign up

Export Citation Format

Share Document